Yes, you should immediately turn off the power or gas supply to your water heater if your home's water supply is shut off. When municipal water pressure drops or plumbing lines are drained, water inside the storage tank can back-siphon out through supply pipes. If an electric water heater's tank empties while active, exposed upper heating elements will overheat instantly, burn out, and create a severe fire hazard. Verification: Flip the dedicated electrical circuit breaker or gas control valve to the "OFF" position whenever main water lines are deactivated.
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